Unfortunate mishap after first hard rainfall.
No further information available
|Personal Comment by Quizmaster Judy Pfaff
|How Collier Solved the Puzzle
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|Quiz #360 Results
1. The Moses Bridge
2. Municipality of Bergen op Zoom, The Netherlands
3. Using two adjustable dams on either side of the moat,
with a small pump under the bridge to drain rainwater.
Unfortunately, the dams and the pump do not work well, and the bridge
flooded during the first heavy rainstorm. See pictures below.
|Answers to Quiz #360
July 15, 2012
|1. What is the name of this bridge?
2. Where is it located?
3. How does it keep the inside from flooding when the water rises?
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|How the Moses Bridge Works
|Ad Kil and Ko Roster
Architects of the Moses Bridge
|The Moses Bridge
2011 Building of the Year
|Architects: RO&AD Architecten
Location: Halsteren, The Netherlands
Client: Municipality of Bergen op
Material used: Accoya wood
Project Area: 50 sqm
Photographs: Courtesy RO&AD
|I could not find much discussion of the means for keeping the water
out of the bridge. However, it appears from the many photos that it is
not articulated to move up and down. In fact, since there is a huge
upward force on the bridge equal to the weight of the displaced
volume of water, the bridge must be strongly anchored to the bottom
of the moat, probably by hundreds of tons of concrete in the
foundations. Therefore I conclude that the water level must be
controlled instead, probably by means of a spillway not too far away
set about 3 inches below the top of the bridge. Or, since this is
Holland, perhaps they have a really big pump standing by. Any casual
water that might come in from rain, small waves, leaks and the like,
could be removed by a small pump or two in sumps below the
I googled (not image-google) "bridge below water line level" and 4 of
the first 5 hits were of this Dutch bridge. On google-images using the
same terms, I got even more hits on the first page. The Wiki article
on the fort gives Lat/Long. I found that the satellite image does not
seem to show water in the moat, nor the bridge.
|My Dad took us on trips to the Upper Peninsula of Michigan to the
road that was lower than the river. It was called the Manisque siphon
The so-called siphon bridge here was once featured in Ripley's
"Believe It or Not" newspaper series. Here the highway was actually
below the river level. Its water actually supported the bridge.
(Highway reconstruction has now removed this novel feature.) The
1941 Michigan Guide, by the WPA Writers' Project, explained the
purpose of this unusual structure:
"In 1916, when the Manistique Pulp and Paper Company was
organized, engineers realized that a dam at the mouth of the river [that
was] large enough to supply the needs of the mill would flood a large
section of the city. If the shallow river banks were diked to hold the
water, bridging the river would be expensive. The problem was
solved by constructing a huge concrete tank lengthwise in the river
bed; the sides of the tank provide artificial banks, higher than the
Concrete bulkheads, formed by the side spans of the bridge, allow the
mill to maintain the water level several feet above the roadbed."
N.B. This isn't well written and hard to understand. It's very
confusing about the relationship between the dam, the dikes,
and the bridge.
But I think I understand.
I gather that the Manistique Pulp and Paper Company built
their dam to supply their mill with water. But instead of building
dikes along the banks of the river to protect the town, along
with a bridge to cross the river, they just built one structure -
the bridge. But they built the sides of the bridge way high, to
hold the water back from flooding the town. The extra water
collecting in the dam's reservoir on the upstream side of the
bridge was prevented from reaching the town on the
downstream side near the mouth of the river by the high
concrete walls of the bridge.
Kind of like driving on the road over the top of the Hoover dam,
Well that's about as close as I can get at the moment.
- Q. Gen.
|Ode to a Sunken Bridge
by John Roberts
A walkway, the Netherlands has
so that visiting tourists can pass
to the Fort de Roovere,
and back, with no fear.
Is it cool? Why, you bet your bottom dollar!
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|Location of bridge
51 deg 31' 38" N, 4 deg 18' 05"E
near Bergen op Zoom, Netherlands.
|Bergen op Zoom in 1649. Note marshes
(left, top right), canalized diversion of
the Scheldt and extensive fortifications.